/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineChatInterface.h
Get cached list of members currently joined in a chat room
true if found
bool GetMembers ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UserId, const [FChatRoomId](API\Plugins\OnlineSubsystem\Interfaces\FChatRoomId) & RoomId, [TArray](API\Runtime\Core\Containers\TArray)< [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FChatRoomMember](API\Plugins\OnlineSubsystem\Interfaces\FChatRoomMember) > > & OutMembers )